Pumping member



y 1937- C. D. STEPHENS l 2,088,042

' PUMPING MEMBER Original Filed Jan. 18, 1930 Sheets-Sheet 1 By MM ATTORNEYZWS July 27, 1937. c.. D. STEPHENS PUMPING MEMBER Original Filed Jan. 18, 1930 3 Sheets-Sheet I a Meal). 5691M INVENTOR.

BY I y I M ATTORNEY.

July 27, 1937. c. D. STEPHENS 2,038,042

PUMPING MEMBER original Filed Ja n. 18-, 1930 s Sheets-Sheet s v M J Q ATTORNEY.

Patented July 27, 1937 UNITED STATES PUMPING MEMBER Charles D. Stephens, San Antonio, 'Te x., assignor, by mesn'e assignments, to Abercrombie Pump Company, Houston, Texas Tex a corporation of Original application January 18, 1930, Serial No.

Divided and this application August 3, 1931, Serial No. 554,740

Claims.

This invention relates to expansible members for pumps of'the character covered by my pending application for Letters Patent of the United States, filed January 18, 1930, Serial No. 421,651, 5 and now Patent No. 1,832,258 issued November 1'7, 1931, of which the present application is a division.

' A specific object of the present invention is to provide for pumps of this character a new and improved expansible member to be. operatively associated with the pump piston and to prevent the pumped fluid from coming into contact therewith.

The preferred embodiment of the invention is illustrated in the accompanying drawings in which Fig. 11s a vertical sectional view of a pump; Fig. 2, an end view in which one of the inlet valve assemblies is shown in section and a portion of the casing is removed as indicated by b the line :r-:r of Fig. 1; Fig.3, a detail view of the expansible member; and Fig. 4, a detail view of the member support.

The pump shown embodies a casing i having twin cylindrical portions la, in each of which is mounted a working cylinder, 8. piston, and a pair of expansible members. v

The casing is provided with a common intake 'port 30 communicating with the chambers A and B within each of the cylindrical portions is of 30 the casing. Between the chambers A and B and Centrally disposed in and spaced from the internal walls of the cylindrical portion I2 is the working cylinder 2; and reciprocable within the cylinder 2 is the piston 5. The normally cylin- 45 drical expansible members and 4 are mounted,

.,respectively, in chambers A and B.

It will be observed that the cylinder 2, and expansible members 3 and 4 are axially aligned. The cylinder 2 has an external annular. flange 50 2a fitting adjacent the internal annular'flange to of the casing. Themember 3 has an internal annular flange 30. at its outer erid which is compressed by and held between the head la of the clamp l and the end wall of the casing. The clamp l is held by the nut 8 on the exterior of the casing. The inner end of this sleeve has an external annular flange 3b which is held by and compressed between the internal flange Ia of the casing and the external flange 2a oi the cylinder.

The inner endof the sleeve 4 has an internal annular flange la compressed by and held between the external fiange'2a of the cylinder and the inner end of the support I2. The outer end of the sleeve 4 has an external annular flange 4b compressed by and held between the ring 13 and the casing head M.

The bodies of these members are preferably made of flexible rubber; the flanges, of less flexible fabric and rubber.

The piston rod 6 extends outwardly through the clamp l which is internally recessed for the reception of the packing 9 compressed by the gland Ill andnut II.

The flange 2a of the cylinder is providedwith oppositely disposed ducts 2b and 2c in communication with the tubes l5 and i6, respectively. These tubes are capped as indicated at 15a and Ito and covered by hollow plugs I1 and I8. Actuating fluid is supplied therethrough to the sleeve 3 as hereinafter explained.

The support l2 (Fig. 4) has four legs I2a and two spaced rings 12b one of which is at the extremities of said legs. The adjacent end of the cylinder 2' snugly flts in said rings. Fitting within the socket in the outer end of the support i2 is the set screw I! by which the member I2 'is made to compress and hold the flange 4a of the I sleeve. This set screw i 9 is carried by the casing head i4.

A sealing gasket 20 is interposed between the casing I and ring l3, as shown.

The casing h'ead I4 is secured to the casing by suitable bolts 2| and is provided with apertures a and Nb closed by the removable plugs 22 and 23. By means of these apertures actuating fluid is supplied to the expansible member 4. The parts may be assembled as follows: The clamp l is placed within the inner end of the member 3. The member 3 and clamp 1 are then inserted through chamber B into chamber der 2 and clamp I, respectively. Packing 9, gland .ill, and nut l I are then placed as shown by Fig. 1.

The ring i3 is then placed upon the member 4; the support I2, within said member. The three are thereupon inserted so that the rings I2b slide upon the cylinder 2 and the flange 4a is carried into contact with the flange 2a and the ,ring l3 into engagement with the gasket 20.

The casing head l4 carrying the set screw I9 is then bolted on the end of the casing. The

flange 4b of the expansible member 4 and the gasket 20 are thereby compressed. The cage I2 is then moved by the set screw H) to compress the flange 4a. of the expansible member 4 and the flange 3b of the expansible member 3.

The piston being in the position shown by Fig. 1, the plugs i1 and I8 and the caps We and [6a are removed, and an actuating fluid, preferably castor oil, is pumped into the sleeve 3 until it appears at the tube l5. The caps Mia and I60. and the plugs l1 and i8 are then replaced.

The piston is then'moved to the right end of the cylinder. The plugs 22 and 23 are then removed, and oil is pumped through the lower aperture in the head I until it appears at the upper aperture, at which time the plugs 22 and 23 are replaced. I

The pump is then ready for operation.

It will be apparent to those skilled in the art that the assembly of the parts may be effected in various ways other than that just described. Attention is invited particularly to the fact that the expansible members 3 and 4 are sealed by means exterior of the casing; and that such means may be employed to simultaneously seal said members.

The operation of the pump may briefly be outlined as follows:

As shown by Fig. 1, when the piston is at its forward position the member 4 is expanded; the member 3, in its normal cylindrical shape. Now when the power means, not shown, moves the piston on its return stroke, the member 3 is expanded by the actuating fluid forced therein, and the member 4 contracted by the withdrawal of actuating fluid therefrom. Upon expansion of member 3, the inlet valve 32 is closed; the outlet valve 31,

axial.

opened; and the fluid in the chamber A is forced through the exhaust port 34. Meanwhile, the

contraction of the member 4 has closed outlet valve 35, opened inlet valve 3!, and drawn a fresh charge of fluid through the intake port 30 into the chamber B.

A reverse operation occurs ,upon forward movement of the piston. The piston forces actuating fluid into the member 4 and draws it from the member 3. Consequent expansion of member 4 effects closure of inlet valve 3|, opening of valve 35, and expulsion of fluid from the chamber B through the exhaust port 34. Simultaneous contraction of member 3 efiects closure of outlet valve 31, opening of inlet valve 32, and suction of fluid through intake port 30 into chamber A.

The alternate expansion and contraction of the expansible members 3 and 4 is radial, and not The invention is not limited to the preferred embodiment shown. made within the scope of the following claims.

I claim:

1. An expansible hollow pumping member having an internal annular flange at one end and an external annular flange at the other end.

' 2. A substantially cylindrical expansible hollow pumping member having open ends, an external annular flange at one end, and an internal flange at the other end.

3. A substantially cylindrical expansible hollow pumping member made of rubber and having open ends, an external annular flange at one end,

and an internal annular flange at the other end.

Various changes may be' 

